Universal Magnetometer with Earth Inductor

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This instrument is marked "DEPARTMENT OF TERRESTRIAL MAGNETISM Carnegie Institution of Washington E.I. - M No 26." It was designed and produced by the Department of Terrestrial Magnetism of the Carnegie Institution of Washington. Unlike the Carnegie's original universal magnetometer, this one is equipped with an earth inductor to determine dip. It was completed in 1914, compared with standard magnetic instruments at the Kew and Greenwich observatories in England, and at the U.S. Coast and Geodetic Survey’s observatory at Cheltenham, Md., and used in many locations around the world.

Ref: J. A. Fleming and J. A. Widner, "Description of the C.I.W. Combined Magnetometer and Earth Inductor," Terrestrial Magnetism 18 (1913): 105-110.

Carnegie Institution of Washington. Department of Terrestrial Magnetism. Land Magnetic Observations, 1911-1913 (Washington, D.C., 1915), pp. 9-12.

Currently not on view
Currently not on view
Date made
Carnegie Institution of Washington. Department of Terrestrial Magnetism
Place Made
United States: District of Columbia, Washington
Physical Description
metal (overall material)
overall (instrument case): 7 1/4 in x 21 1/4 in x 15 3/4 in; 18.415 cm x 53.975 cm x 40.005 cm
overall: 7 in x 15 1/2 in x 21 1/4 in; 17.78 cm x 39.37 cm x 53.975 cm
ID Number
accession number
catalog number
Credit Line
U.S. Department of Commerce, Coast & Geodetic Survey
Science & Scientific Instruments
Science & Scientific Instruments
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Data Source
National Museum of American History